wandel



3 Sheets-Sheet 1.

(No Model.)

G. WANDEL. STRAINER FOR CHEMICAL WOOD PULP.

No. 478,179. Patented July 5, 1892.

(No Model.) 3 Sheets8heet 2. 0. WAND-EL. STRAINER FOR CHEMICAL WOODPULP.

No. 478.179. Patented July 5, 1892.

me Now (No Model.) 3 Sheets-Sheet 3. C. 'WANDEL. STRAINER FOR GHEMIGALWQOD PULP.

, PatentedJu lffi, 1892;. a Y w Ja /a1 l UNITED :ii iS'lATES PAT NTOFFICE of the same, which may then be employed for inafter moreparticularly described, and which consists, mainly, of a rotatingcylinder. proeasily intelligible, I refer to v theaccompany-,CHRISTIALN'IWANDEL, or,

REUTLINGEN, GERMANY.

srncrrlcarroiv rermin path is Letters Patent No. 478,179, dated July 5,1892.

' AppIicationfiled-TuIyZ-B,1889. jewel Slaves. (nu-made.)

To all whom it mag concern:

Be it known that I, CHRIsrrAuWANDEL, a

subject of the King of VVurtemberg, and a resident of Reutlingen,Germany, have. invented certain new and usefullmprovements in Strainersfor Chemical Wood Pulp, of which the following is a full, clear, andexact description.

My present invention consists of a strainer for 'Wood pulp for use inthe paper industry; and its object is to remove all impurities from thesaid pulp and thus sort out the finest part manufacturing all thesuperior sorts of paper up to the very finest qualities, while thecoarser pulp, with the impurities contained therein, may be employedeither in the same state in which it is separated or after againhavingbeen sorted for making packing-paper and inferior papers generally. Iattain this object by means of the apparatus herevided with fine slotsalong its entire surface and having interior wings, such cylinder beingcaused to revolve in a vat or trough containing the unsorted pulp mixedwith a large quantity of water. The trough is provided with suitableinlets for the pulp and water, which are caused to pass through theslotted cylinder, by which means all the coarser parts and impuritiesare separated out, as the slots in the cylinder are not wide enough toallow them to pass through.

In order to make this specification more ing drawings, in which similarletters denote similar parts throughout the several views.

Figure 1 is a longitudinal section through the center of the apparatus.Fig. 2 is a plan; Fig. 3, an end elevation, and Fig. 4 a section on lineA B in Fig. 2.

The pulp mixed with a large quantity of water is passed into the trougha through the inlet a. In this trough a is mounted the cylinder or drum1), which is perforated throughout with slot-s or fine slits c, saidcylinder being mounted on the horizontal shaft 17', running in thebearings b 22*, arranged at each end of the trough. The drum 1) hascircular outlets at each end concentric with the shaft and opening intothe channels 6 e, which join to form one common channel fin front of theapparatus, Fig. 2.

In order to'prevent communication between thechamber or trough a and theoutlet-channels e e fi'the drum ends are mounted in the stuffing-boxesand glands g 9, so that the drum-perforations form the only communications between the chamber a'and the outlets. .The'drum b isfurther provided with interior longitudinal blades 61 (1, arranged asshown in Fig. 4. These blades run the whole length of the drum and aremade to slant inward at an angle preferably of about forty-five degreesto a tangent passing through their point of juncture with the innerperiphery of the drum. At the bottom of the trough a a channel or gutterhis arranged, having a hinged cover 1.

When the apparatus is at work, this cover is open and all the coarserparticles of pulp, as also the impurities which are unable to pass theperforations of r the drum, sink to the bottom of the'trough and by themotion 'of the drum will be carried into the gutter it.

By closing the cover t' and removing the plug level up to about theheight shownin Fig. 4.

The drum is set inquick rotation by means of suitable connect-ions andsheave-pulleys C O. The wings or fans 'd' cl now suck the water and pulpthrough the slotted drum b, which, however, only admits the finestparticles of cellulose, keeping out all coarser particles andimpurities. The wings on the interior of the cylinder have the purposeof preventing the pulp from depositing at the bottom, and, furthermore,of keeping up a sharp circulation of the liquid toward the center of thedrun1i. 9., toward the outlets-thus preventing the finer particles whichhave entered the drum from eventually passing out again at the bottom.As the outlets of the drum are considerably larger than the inlets(slots c) to the same, the liquid-level in the trough a will be alwayshigher than that in the drum, so

that the possibility of particles escaping which have once entered thedrum through the slots is excluded, the only exit being at w 00.

Having now particularly described and ascertained the nature of myinvention, what I claim is- 1. In an apparatus for straining chemicalwood pulp, the combination of the trough a, having mounted thereinarotary drum 1), perforated with slots 0 and provided with interiorwings rl cl, said drum. having centrallyarranged outlets in its endsleading out of the trough a, stuffing-boxes and glands g g forpreventing communication between the drum-outlets and the interior ofthe trough a, and suitable means for rotating the drum 19, substantiallyas described.

2. In an apparatus for straining chemical wood pulp, the combination ofthe trough (1, having outlet-passages e e f and having the gutter h andcover'i, arranged as described,and clearing-hole 7a with a rotary drumb, having perforations c and interior wings d d and having itscentrally-arranged end outlets a; m communicating with theoutlet-passages e e of the said trough a, the stuffing-boxes and glandsg g, and suitable means for rotating the said drum, substantially asdescribed.

In witness whereof I have hereunto set my hand in presence of twowitnesses.

CHRISTIAN WANDEL.

Witnesses:

OHR. GRosINGER, EMIL REEG.

